Adds prometheus export point to the agent pod. (#2983) #13960

Job	Run time
towncrier_check	9s
check_if_release_branch	1s
changed_files	7s
build mirrord CLI	0s
lint	12m 6s
integration_tests	13m 56s
check-rust-docs	4m 6s
lint_markdown	0s
macos_tests	33m 38s
test_agent	3m 37s
test_agent_image	6m 58s
test_cli_image	15m 16s
e2e (docker)	14m 50s
vscode_e2e_on_release_branch	0s
e2e (containerd)	6h 0m 20s
intellij_e2e_on_release_branch	0s
ci	1s
	7h 45m 5s

Provide feedback